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We demonstrated all-fiber single-channel bandpass filters formed by a high-attenuation metal-doped fiber as a core mode blocker spliced between two long-period fiber gratings (LPFGs). The LPFGs were written in dissimilar fibers, and their grating periods were adjusted so as to match the resonance wavelengths of only one pair of the same order cladding modes and also avoid matching those of other cladding...
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